package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderDetailMapper;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.*;
import java.util.stream.Collectors;

/**
 * @Author: Z.lx
 * @Date: 2025/8/2 09:49
 * @Description:
 **/

@Service
public class ReportServiceImpl implements ReportService {

    private OrderMapper orderMapper;
    private UserMapper userMapper;
    private OrderDetailMapper orderDetailMapper;
    private WorkspaceService workspaceService;
    @Autowired
    public void setWorkspaceService(WorkspaceService workspaceService) {
        this.workspaceService = workspaceService;
    }

    @Autowired
    public void setOrderDetailMapper(OrderDetailMapper orderDetailMapper) {
        this.orderDetailMapper = orderDetailMapper;
    }

    @Autowired
    public void setUserMapper(UserMapper userMapper) {
        this.userMapper = userMapper;
    }

    @Autowired
    public void OrderMapper(OrderMapper orderMapper) {
        this.orderMapper = orderMapper;
    }

    /**
     * @Description 用户统计
     * @Param [begin, end]
     * @Date 2025/8/2 10:02
     **/
    public UserReportVO userStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = formatTime(begin, end);

        List<Integer> userList = new ArrayList<>();
        List<Integer> totalList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map<String, Object> map = new HashMap<>();
            Integer totalUser = userMapper.userByTime(map);
            map.put("begin", beginTime);
            map.put("end", endTime);
            Integer newUser = userMapper.userByTime(map);
            userList.add(newUser);
            totalList.add(totalUser);
        }
        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .newUserList(StringUtils.join(userList, ","))
                .totalUserList(StringUtils.join(totalList, ","))
                .build();
    }

    /**
     * @Description 销售额统计
     * @Param [begin, end]
     * @Date 2025/8/2 16:07
     **/
    public TurnoverReportVO turnoverStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = formatTime(begin, end);

        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map<String, Object> map = new HashMap<>();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }
        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }

    /**
     * @Description 订单统计
     * @Param [begin, end]
     * @Date 2025/8/2 16:08
     **/
    public OrderReportVO ordersStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = formatTime(begin, end);

        List<Integer> orderCountList = new ArrayList<>();//每日订单数
        List<Integer> validOrderCountList = new ArrayList<>();//每日有效订单数

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Integer orderCount = orderCount(beginTime,endTime, null); //每日订单数

            Integer validOrder = orderCount(beginTime, endTime, Orders.COMPLETED); //每日有效订单数

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrder);
        }

        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).orElse(0);//订单总数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).orElse(0);//有效订单数
        double orderCompletionRate =0.0;//订单完成率
        if(totalOrderCount != 0){
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
    * @Description 获取销量前十
    * @Param [begin, end]
    * @Date 2025/8/2 20:26
    **/
    public SalesTop10ReportVO top10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> top10List = orderDetailMapper.getByTime(beginTime, endTime,Orders.COMPLETED);

        List<String> names = top10List.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");
        List<Integer> number = top10List.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(number, ",");


        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 导出运营数据报表
     * @param response
     */
    public void exportBusinessData(HttpServletResponse response) {
        //1. 查询数据库，获取营业数据---查询最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        //2. 通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            //基于模板文件创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //获取表格文件的Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);

            //获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            //获得第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获得某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //3. 通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
    //统计指定时间区间内订单数量
    public Integer orderCount(LocalDateTime begin, LocalDateTime end, Integer status) {
        Map<String, Object> map = new HashMap<>();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status", status);
        return orderMapper.totalOrder( map);
    }
    //格式化时间
    public List<LocalDate> formatTime(LocalDate begin,LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        //循环，日期+1，添加到dateList
        while (!begin.isEqual(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        return dateList;
    }
}
